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Air

"WASHINGTON - The United States has made progress in reducing dangerous air pollution since 1990 but work remains to reduce risks for the country's most overburdened urban areas, the U.S. Environmental Protection Agency's top official said on Thursday."

"New research from NASA's Goddard Space Flight Center shows that large quantities of a chemical responsible for depleting the ozone layer are still being emitted, even years after an international ban."

"SAN FRANCISCO — The threats from climate change are many: extreme weather, shrinking snowpack, altered ecosystems and rising and more acidic seas, to name a few. Another lesser-known issue may hit especially close to home for city dwellers. In the world’s already smoggy metropolises, pollution is likely to grow worse, a phenomenon scientists have taken to calling the climate penalty."

"In a big win for environmentalists, the Supreme Court on Monday effectively endorsed the Obama administration’s efforts to regulate greenhouse gas emissions from sources like power plants, even as it criticized what it called the administration’s overreaching."